Tworzenie folderu skompresowanego .zip

string startPath = _configuration.GetConnectionString("FileRepository");
string zipPath = $@"{startPath}\ERAD\{m.PackId}.zip"; // folder docelowy
string toZipPath = $@"{startPath}\ERAD\{m.PackId}\"; // folder źródłowy 
string Pasword = "123";


var zipFile = new FastZip
{
    Password = Pasword,
    CompressionLevel = ICSharpCode.SharpZipLib.Zip.Compression.Deflater.CompressionLevel.BEST_COMPRESSION,
    CreateEmptyDirectories = true,
};
zipFile.CreateZip(zipPath, toZipPath, true, "");

/// <summary>
		/// Gets or sets the setting for <see cref="UseZip64">Zip64 handling when writing.</see>
		/// </summary>
		/// <remarks>
		/// The default value is dynamic which is not backwards compatible with old
		/// programs and can cause problems with XP's built in compression which cant
		/// read Zip64 archives. However it does avoid the situation were a large file
		/// is added and cannot be completed correctly.
		/// NOTE: Setting the size for entries before they are added is the best solution!
		/// By default the EntryFactory used by FastZip will set the file size.
		/// </remarks>
		public UseZip64 UseZip64
		{
			get { return useZip64_; }
			set { useZip64_ = value; }
		}

            Process pr=Process.Start("zip", "-r nameoffile.zip directory");
            pr.WaitForExit();
            int ret = pr.ExitCode;
            // https://www.computerhope.com/unix/zip.htm

using Ionic.Zip;


int numberOfTurn = 1;
        int numberForLastPack = 1;
        int numberForFolder = 1;
        int filesNumber = Directory.GetFiles(zipPath).Count();

        var zip = new ZipFile();
        foreach (string file in Directory.GetFiles(zipPath))
        {
            zip.Password = Pasword;


            zip.AddFile(file, @"\");

            if (numberOfTurn == 50 || numberForLastPack == filesNumber)
            {
                string FinalZipPath = $@"{toZipPath}\{genContractFileName}_{numberForFolder}.zip";
                zip.Save(FinalZipPath);
                zip.Dispose();
                zip = new ZipFile();
                numberOfTurn = 1;
                numberForFolder++;
            }
            numberOfTurn++;
            numberForLastPack++;
        }